Circular sewing attachment of a sewing machine

ABSTRACT

Structure of attachment for circular sewing of a sewing machine is able to be easily dismounted or mounted to the sewing machine, and allows for a diameter of circular sewing to be changed continuously.

FIELD OF THE INVENTION

The present invention is related to the attachment for circular sewingof a sewing machine and characterized by being convenient and enablingit to cut down the cost while it simplifies the structure of theattachment and enables it to dismount and mount to the sewing machinesimply.

BACKGROUND OF THE INVENTION

The attachments for circular sewing in the sewing machine, for example,they are used to mount the attachments to the front right side of aneedle position like the patent literature 1(HEISEI5-60478), the patentliterature 2(SYOUWA62-23682) and the patent literature3(SYOUWA62-23681). And on the patent literature 4(HEISEI 5-48879),patent literature 5(HEISEI 4-375) together with patent literature6(HEISEI 3-17778), it exists with the one did it as the attachment ismounted to the front left side of the needle position.

Because circular sewing attachment of the patent literature 1˜3 areinstalled to the right side of the needle position, there is a faultthat it is easy to become the prevention of sewing work of the sewingmachine on feeding the cloth, and the so on. Though, there is anadvantage which doesn't obstruct sewing work with attachments of thepatent literature 4, 5 and 6, it requires to prepare a complicated drivecontrol unit to the attachment for circular sewing like patentliterature 4 and also a auxiliary table with a ditch should be necessaryfor like patent literature 5, and a circular table is driven speciallyby drive mechanism required as patent literature 6. Also, there was theinconvenient point that be able to select the diameter of possiblecircular sewing only intermittently and be not able to change thediameter of a circular sewing, continuously.

As mentioned above, the usual circular sewing attachment had acomplicated structure and it becomes expensive, and moreover they had adisadvantage that the user-friendliness is bad with points that isvarious.

DESCRIPTION OF THE INVENTION SUMMARY OF THE INVENTION

From over, in order to solve the above-mentioned first problem, thepresent invention provides a circular sewing attachment for a sewingmachine, which is so constructed with simplified structure so that it isable to make cost down, and it is also able to be changed the diameterof circular sewing continuously, beside enables it to dismount or mountthe circular sewing attachment to the sewing machine easily, so that itbecomes convenient to operate the attachment.

So as to solve the 2nd problem, the present invention provides acircular sewing attachment for a sewing machine, which makes it possibleto form the circular sewing over the 2nd circumference with which itcomes close to inside or outside of circular sewing of the 1stcircumference that is formed to the sewing material. For the 3rdproblem, by using overlock sewing machine, it is possible to perform thecircular sewing with wide width of seam as wider as possible every eachcircumference.(Such means that solves the problem=Summary of the invention)

Thereupon the present invention, so as to solve the above mentionedproblems, provides the fixed frame and the movable frame, the fixedframe having two sections, a mount section and a support section,wherein the mount section is mounted or dismounted free through a setscrew to the front frame of a sewing machine and the support section isprepared at the part extended in the direction of a needle plate sidefrom this side of the front of sewing machine along the edge of a bed ofsaid sewing machine which is prepared for an unit together with saidmount section on said fixed frame; besides it is overlapped to the abovementioned support section, a scale section movably supported on saidmovable frame and that make the slide to the direction of right andleft, extended part of said movable frame from one end of said scalesection is bent around the part of said needle plate and is overlappedto the surface of the bed of said sewing machine, furthermore saidmovable frame extends to the top section that is located at the leftside of said needle plate and a needle position with which they areprepared for an unit on said movable frame; said movable frame havingsaid top section on which the pin that the tip turned upward and isfixed, and provides an adjustment screw that is inserted to the slotprovided along the longitudinal direction of above mentioned scalesection and fixes movable frame overlapped to said support section ofsaid fixed frame.

In such condition of mounting the attachment to said sewing machine,said sewing machine is driven after pricking the sewing material thatbecomes as a sewing product, with said pin that is fixed on said topsection of said movable frame and by operating usual sewing, thus thisattachment is to make possible forming a circular sewing in said sewingmachine to said sewing material as make above mentioned pin the centerof circle and as radius with the length until the needle position.

And the invention of the claim 2, in the attachment for said circularsewing comprises the structure of above mentioned claim 1, by operatingthe adjustment screw, the fixation of said scale section being fixed tosaid support section is canceled, and shift said scale section to theposition of the request along said slot prepared on the scale section ofsaid movable frame, change the radius, from said pin to said needleposition, and is able to fix in the position of the request.Furthermore, in the invention of Claim 3, by using overlock sewingmachine for the circular sewing, it is possible to make the form thecircular sewing with wide width of seam as wider as possible thereby itis obtainable the sewing product that is rich to the characteristics ofdecoration; when overlock sewing machine with cutting device is used,while sewing of wipstitch, it is also possible at the same time, to cutoff the excessive sewing material.

EFFECT OF THE INVENTION

The attachment for circular sewing concerning the present invention, iscomprises only two frames as main frame which are said fixed frame andsaid movable frame; said fixed frame provides said mount section andsaid support section that are prepared for an unit and said movableframe provides said scale section prepared with a slot and said topsection prepared with said pin that becomes the center of circle, it isjust required adding only two screws, a set screw and an adjustmentscrew to the above mentioned two main frames frames and all thestructure of this attachment is completed; as mentioned above, thenumber of necessary parts for this attachment is quite few and thereforeit is very easy to make a cost down for said attachment as the structureis extremely simplified and also is very easy to operate said sewingmachine because the location of mounted attachment is on the left sideof said needle position and it is convenient that diameter of circularsewing can be changed continuously.

Furthermore, said attachment for the circular sewing concerning thepresent invention, by the usual operation with the presser foot and thesewing needle and adding work of feeding sewing material by a feed dog,it is resulted that said sewing material turns automatically without anyspecial operation and the circular sewing is formed with specifiedradius that wrinkle was determined nonexistent on the sewing material.

PREFERRED EMBODIMENT OF THE INVENTION

The set screw to the sewing machine and said mount section is mounted ordismounted free through above mentioned set screw to the front frame ofthe sewing machine and said support section is prepared at the partextended in the direction of a needle plate side from this side of thefront of a sewing machine along the edge of a bed of said sewing machinewhich is prepared for an unit together with said mount section on saidfixed frame that made of plane metal plate; besides it is overlapped toabove mentioned support section, said scale section movably supported onsaid movable frame and that enable the slide to the direction of rightand left, extended part of said movable frame from one end of said scalesection is bent around the part of said needle plate and is overlappedto the surface of the bed of said sewing machine, furthermore saidmovable frame extends to the top section that is located at the leftside of said needle plate and a needle position with which they areprepared for an unit on said movable frame; said movable frame havingsaid top section on which the pin that the tip turned upward and isfixed, and provides said adjustment screw that is inserted to said slotprovided along a longitudinal direction of above mentioned scale sectionand fixes movable frame overlapped to said support section of said fixedframe;

In such condition of mounting the attachment to said sewing machine,said sewing machine is driven after pricking the sewing material thatbecomes as a sewing product, with said pin that is fixed on said topsection of said movable frame and by operating usual sewing, thus saidattachment has a structure that enable the sewing of the circular sewingas make above mentioned pin the center of circle and as radius with thelength until the needle position.

EMBODIMENT

FIG. 1 is a plane view showing the state of mount of the embodiment.

FIG. 2 is a left side view showing the state of mount of the embodiment.

FIG. 3 is a dissolution strabismus figure of this attachment.

In the figure showing the embodiment, 1 is the fixed frame fixed to asewing machine, 2 is the movable frame that overlapped to the fixedframe 1 and is able to slide to the left side or the right side, 3 isthe set screw that fixed fixed frame 1 to a sewing machine, 4 is theadjustment screw that fixed the movable frame 2 to the fixed frame

A mount section 7 is fixed to a sewing machine by use of a set screw 3and a support section 10 is prepared at the part extended in thedirection of a needle plate side from this side of the front of thesewing machine along the front edge of a bed 8 of the sewing machine andthe both sections are prepared on the fixed frame 1, further besides itis overlapped to the support section, a scale section 11 is movablysupported and that enable the slide in the direction of right and left,the extended part from one end of the scale section is bent around thepart of a needle plate of the sewing machine and after it is overlappedto the surface of said sewing machine, it is further extended to the topsection 13 at where it is located left side of the needle plate 9 and aneedle position 12, and that is prepared for a unit together with thescale section, the top section 13 of the movable frame 2, provides thepin 16 that is fixed on it and the tip turned upward, the adjustmentscrew 4 is prepared, that is inserted to the slot 14 provided along thelongitudinal direction of the scale section and fixes the movable frameat the desired position, and that is overlapped to the support sectionof the fixed frame 1; In the condition of mounting the attachment to thesewing machine, the sewing machine is driven after pricking the sewingmaterial with the pin; by operating usual sewing, the attachment is tomake possible forming the circular sewing as making above mentioned pin16 the center of circle and as the radius with the length until saidneedle position 12.

As shown in FIG. 2, fixed frame 1 incline along the frame 5 of a sewingmachine, provide the mount section 7 that prepared a insert hole 6 forthe set screw 3 and the said support section 10 extended from this sideof the front side of a sewing machine, in the direction of the needleplate side 9 along the front edge of the bed 8 of a sewing machine whichthey are prepared for an unit;

The said movable frame 2 provides the said scale section 11 at the oneend that is overlapped to the said support section 10 and other partextended from the one of edge of the said scale section 11 and turnsaround a part of the needle plate 9 to the right angle and is overlappedto the surface of the bed 8 of a sewing machine; the top section 13 islocated at the end part of the extended movable frame and on the leftside of the needle plate 9 and the needle position 12.

Said scale section 11 indicates the scale 11′ along the edge, andprovides a slot 14 that locates in the center along the longitudinaldirection and the adjustment screw with head 4 that inserts to said slot14 and to the screw hole 15, and by the tightening said screw, saidscale section 11 together with said movable frame 2 are bonded to saidfixed frame 1 to be an unit;

The top portion 13 has the pin 16 that the tip turns upward and fixed onand the length from said pin 16 to the said needle position 12 becomesas the radius of the circle for the circular sewing and namely, in thisembodiment, at the pointing location with the edge 19 of the left end ofsaid support section 10 on the scale 11′ of said scale section 11 showsthe length as radius that is shown in FIG. 1, is indicating that is theradius of 45 mm of the circle for circular sewing.

Furthermore, 17 in the FIG. 1, is extended from the edge on the side ofthe front of the corner part of the movable frame 2 and hang on the edgeof the bed 8 of a sewing machine in the mounting condition of theattachment and as the working of the feeding the sewing material, theinstallation location of movable frame 2 deviates from the originallocation, occasionally, so as to prevent this kind of deviation, 17 isable to apply to the purpose; 18 in the FIG. 1 shows a presser foot forthe sewing material located on the needle plate 9.

Next an explanation will be given of an example of use of embodiment.The attachment mounts to a sewing machine and desired sewing materialfor example, a square cloth etc., pricks said pin 16 of said movableframe into the center of such square cloth and then said sewing machineis driven,

The starting end of the circular sewing is put in needle position 12that has a radius R from said pin 16 and by the operation of a feed dog,sewing needle and a presser foot for the sewing material 18 though theirillustration are omitted, said circular sewing with said pin 16 as thecenter of circle starts; when said circular sewing begins, the hem partof the sewing material is fed and makes anti-clockwise circular motionautomatically by driving of a feed dog at the hem part and by the seamof said circular sewing returns at the point of starting end, one roundof said circular sewing is completed. Their operation's drawings areomitted.

When the radius of circular sewing is changed, loosen adjustment screw4, while seeing scale 11′ of scale section 11 of said movable frame 2and shifts the said movable frame 2 to right side or left side, and bytightening adjustment screw 4 after transfer to the position of therequest and radius of said circular sewing changes to the length fromsaid pin 16 to said needle position 12 in the time; furthermore, whenoverlock sewing machine is used for circular sewing it is possible toobtain the sewing material with rich nature of decoration after thewidth of the seam applied as much as possible wider.

In this case, by the use of overlock sewing machine with cutting device,it is also possible to have the attractive work of cutting off excessiverelating material, while operating simultaneously, said circular sewingof wipstitch at the Hem part of outer circumference.

Also, at the finished position of 1st circumference circular sewing, itis possible to make the multiple circular sewing when radius R extend orshorten to the length corresponding to width of the seam. Even in thecase of making such sewing product, the use of the overlock sewingmachine is advantageous.

The sewing product applied with the circular sewing are used to the potstand and the coaster etc., in addition to the applique.

Industrial Applicability

In the attachment concerning with the present invention, the form ofinstallation metal fittings or the form of movable frame are not limitedto the mode of the embodiment and be obvious the change that designs itproperly along the gist of this invention, to go out and cut.

BRIEF EXPLANATION OF THE DRAWINGS

FIG. 1. is a plane view that shows the installation condition of theembodiment.

FIG. 2. is a left side view that shows the installation condition of theembodiment

FIG. 3. is a dissolution strabismus figure of this attachment.

EXPLANATION OF THE SIGN

-   1. Fixed frame-   2. Movable frame-   3. Set screw-   4. Adjustment screw-   5. Frame of sewing machine-   6. Insertion hole of the screw-   7. Mount section-   8. Bed of sewing machine-   9. Needle plate-   10. Support section-   11. Scale section-   11′ Scale-   12. Needle position-   13. Top section-   14. Slot-   15. Screw hole-   16. Needle-   17. Stopper for the attachment-   18. Presser foot-   19. Pointing edge

1. A mount section is detachably mounted through a operation of setscrew to a sewing machine and a support section is prepared at the partextended in the direction of a needle plate side from this side of thefront of the sewing machine along the front edge of a bed of the sewingmachine which are prepared for an unit on a fixed frame; besides it isoverlapped to the above mentioned support section, a scale sectionmovably supported that enable the slide to the direction of right andleft, the extended part from one end of the scale section is bent aroundthe part of the needle plate and is overlapped to the surface of the bedof the sewing machine, moreover to have a extended top section that islocated at the left side of the needle plate and a needle position thatthey are prepared for an unit; a movable frame provides the top sectionon which the pin that the tip turned upward, is fixed, and an adjustmentscrew that is inserted to the slot provided along a longitudinaldirection of above mentioned scale section and fixes movable frameoverlapped to said support section; In such condition of mounting theattachment to the sewing machine, the sewing machine is driven afterpricking the sewing material that should make sewing product, with thepin on the top section of above mentioned movable frame, by operatingusual sewing, the attachment is to make possible forming the circularsewing that make said pin the center of circle and the length until theneedle position as radius, in the sewing machine, to the sewing material2. A circular sewing attachment as set force in claim 1, characterizedin that above mentioned set screw to be operated to shift the fixedposition of a scale on above mentioned slot, changes the radius which iscaused by the length from above mentioned pin until the needle positionand to form the circular sewing over 2nd circumference at the outside orinside of the form of 1st circumference circular sewing made to abovementioned sewing material:
 3. A circular sewing attachment as set forcein claim 1, characterized in that in above mentioned sewing machine,overlock sewing machine is used, to form the circular sewing with theseam of wide width.